Lewis, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.6 °C (low) to 20.1 °C (high). Annual precipitation averages 677.7 Millimeters. Lewis is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 6.6 °C | 19.05 mm |
| February | -4.6 °C | 8.9 °C | 20.83 mm |
| March | 0.5 °C | 14.4 °C | 43.43 mm |
| April | 5.4 °C | 19.7 °C | 60.2 mm |
| May | 11.6 °C | 24.9 °C | 103.12 mm |
| June | 17.2 °C | 30.7 °C | 96.27 mm |
| July | 19.7 °C | 33.3 °C | 92.96 mm |
| August | 18.7 °C | 32.2 °C | 89.41 mm |
| September | 14.2 °C | 28.3 °C | 49.02 mm |
| October | 6.9 °C | 21.4 °C | 56.64 mm |
| November | 0.1 °C | 13.6 °C | 23.11 mm |
| December | -4.8 °C | 7.3 °C | 23.62 mm |
| Annual | 6.6 °C | 20.1 °C | 677.66 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |